Propagate errors from fetch-pack correctly to git-fetch.
Propagate errors from fetch-pack correctly to git-fetch.

When git-fetch-pack fails, the command does not notice the failure
and instead pretended nothing was fetched and there was nothing wrong.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git